Automobile tire valve



July 11, 1933.` wr. coNRAD 1,917,499

AUTOMOBILE TIRE VALVE Original Filed Feb. 14. 1928 BY w HIS ATTORNEYPatented July 11, 1933Y unirse s'rn'rss i wiz-Luau fr. sonnen, orLAWN-nannxcerimennrn Annonce-ILE erna entre.

Application ledjFebruary lpliseral N'O.V 254,233'. Renewedilllay 2U,1932. n

This application: is a continuation in part of' my prior-application,Serial #154,1291, tiled llecember 11, 15926, andentitledf Automobiletire valve.

This invention relates tio-valves, such as are commonly used forautomobile tires; rIhese valves are arranged in anippl'e fastened to thetire, andi serve tocheck the escape of air from the tire,altlioirglipermitting the entry oit' compressed air thereto lt i's oneof' the objects of my invention to provide a tire valye that h-asacompound sealing effect, so that the danger of'losing air from the tireis minimized. y

It is another obect of my invention toA securey thesel beneficialresul-ts by utilizing the usual valveV rubber not onlyas a: gasketagainst a: tapered shoulder in the nipple, but also to actY as oneelement' 'l'or an' additional ValveV closure. In this connection',` lalso infale it possible to hold this valve rubber lirmly in pla-ce inspiteofcontinued use', and to urge the rubber tightly' in place in thetaperedv shoulder without danger of' it being stripped oil' the valvestructure.

It is still another object of my invention to" simpliify the structureoi" such' valvesA and toma'lre it possibleto L ssemblethe-valve partsexpeditiously.

My invention possesses many otherI advan tages', and has' other objectswhich may be inademore easily apparent from ayconsider'- ation of oneembodiment of myl invention.

' For thisI purpose I haveV shown av formzin the drawing accompanying;and formingpart of the present speciii'cati'on. I shall now proceed todescribe this form in detail, which illustrates the general principlesof my invention; but it is to be understood that this detaileddescription is not to be taken in a limiting sense, since the scope ofmy invention is best defined by the appended claims.

Referring to the drawing:

The single figure is a greatly enlarged sectional view of a valveembodying my invention, and shown as in place in a tire valve nipple.

The nipple 11 is shown as of conventionalform, having a reduced threadedupper portion 12over which the 'usual tire valve capk can fit', in awell understood manner.. T is nipple pr ojeots from the inner tube, towhich it is fastened, andi is shown asfthreaded ex.- ternally. 'lt is;also threaded internally for a short distance; and below the threadedportion, there is a converging tapered? shoulder E31 tliat leadstothebore 145. Through this brneair is arranged to beZ passed from aVsource of compressed' A valve structure now to bedescribed normallycloses t'hebore 14 against escape of' air outward-'ly tronr the tire.

- For this purpose, use is made el a resilient Y gasket or plug'- 15,that seats onto the tapered shoulder 13. 4'll'iis gasket can. be madefrom soft' rubber or its equivalent, so-V that it can be tightlysq-ueeZedontoA-the shoulder toprevent esca-pe of air between theshoulder and l.

the gasket, and to confine the ingress: and egress of! air through acentralapertaire formed by the valve structurel To delfino this centralaperturer utilize a bushing- 16 o'metal, over which the'gashet 155 isdisposed'. v This bushing has a lower flan-ge 117 and an upper flange 1Sbetween Wh-ieh the gasket isr conlined, and1 over which it canbe readilystretchedr when assembling the valve.` Furthermore, the bush-ing' L6"has au intermediate flange 19? of smaller diam eter,l which serves, asthe bushing 16 is urged vinwardly as willv be hereinafter described, to

clamp the gasket l'solid-ly against the shoul der; 3' and to prevent itfrom thereafter be-V .7 Y l ing axially displaced.

The gasket 15 is urged into position by the aid the memberQO that can bescrewed into nippleL l2, as bythe afi'di of the valve cap in a wellunderstood manner. This member 20 is tubularand has two di'ametricallyvopposite projections 21 that can be engaged by the cap to rotate it inor out of nipple 12. The lower portion of member 2O is crimped in`underthe extension 22 of tubular member 16, which is provided for thispurpose Vwith a slanting face. The engagement between parts 20 and l 22'is loose, torpermit relative rotation. InV this way, the gasket 15 canbe moved axially without rotating it, thus ensuring against its abrasionor other injury in the bore. p

A valve stem 23- extends through bushing i 16 and also throughmember'20. It carries l ried at the end of stem 23, engaging thebottomsurface of gasket 15. Thus this gasket serves a double purpose; thatusually required of it, and also as a valve seat. Y

A spring 25 is used to urge the stem 23 to closing position, and forthis purpose it is confined between the top of bushing 16 and theprojections 26 near the top of rod 25. To release Cup 24 from engagementwith gasket 15, a downward pressure, compressing spring 25, isnecessary. This is automatically accomplished by a nozzle engaging saidstem when used to conduct air to the nipple 12; and stem 23 is for thispurpose extended above the nipple 12.

The cup 24 can be fastened to the stem 23 as by driving it on a taperedportion of the stem, and by the aid of the projections 27 that areformed by upsetting.

In order to form a double seal, the cup 24 carries a closure member 28of rubber, which cooperates with the tapered edge of flange 17. Thus forair to leak from bore 14 through the tubular member 16, it must creepnot only upwardly past the edge of cup 24, but thereafter downwardlypast the edge of flange 17, In this way, a tort-nous passageway for anyescaping air is provided, which is so diflicult to traverse that verylittle air escapes even after continued long use, and even if the auto`mobile is driven over rough roads.

The closure 28 is retained in place by the aid of a flanged sleeve 29.The ange rests over the closure, and the sleeve part is placed on stem23 and into closure 28. The stem 23 carries a narrow flange 30 thatengages the sleeve iange. This flange 30 is small enough in diametertopass through bushing 1 6. An important function of the flange onV sleeve29 is to act as a stop against too great an embedding of cup 24 ingasket 15, as well as offlange 17 in closure 2S. This stop function issecured by the edge of the flange contacting with the interior taperedsurface of flange l?, limiting the upward axial movement of. stem 23 andits associated parts. Without this precaution, the rubber parts may beseriously injured.

Amy hand.

It is evident that I have developed a simple and compact valvestructure, capable of use in standard nipples, and that can keep the airin the tires for a long period.

I claim :v

1. In a tire valve construction arranged to coaet with a tire valvenipple having an internal tapered shoulder, athreaded body Amemberarranged to be screwed into said nipple, an extension for said member, abushing having a grooved llange, the extension engaging said groove soas to permit said bushing to rotate with respect to the extension, saidbushing having a pointed flange at the bottom, a resilient gasketdisposed on said bushing between the Hangesand arranged to `coact withthe tapered shoulder, said bushing also having an intermediate flange toserve as a support for the gasket, a valve stem extending through thebushing, a cup on said stom having its edge arranged to coact with thebottom of the gasket to serve as a closure, a resilient closure memberin the cup coacting with the pointed flange to provide another closure,a sleeve in vsaid closure member cooperating with the pointed flange tolimit their relative axial movement, and resilient means for urging the`stem to closing position. Y

2. Ina tire valve construction arranged to coact with a tire valveynipple having an internal tapered shoulder, a threaded'body memberarranged to he screwed into said nipple, an extension for said member, abushing having a grooved fiange, the extension engaging said groove soas to permit said bushing to rotate with respect to the extension, saidbushing having another flange at the bottom, a resilient gasket disposedon said bushing between the flanges and arranged lto coact` with'thetapered shoulder, a valve stem e.\'- tending through the bushing, a cupon said stem having its edge arranged to coact with the bottom of thegasket to serve as a closure, a closure member in the cup coaoting withthe bottom flange on the bushing to provide another closure, andresilient means for urging the stem to closingposition.

In testimony kwhereof .I have hereunto set WILLIAM T. CONRAD.

